Coro is a collection of modules which manages continuations in general, most
often in the form of cooperative threads (also called coros, or simply "coro"
in the documentation). They do not actually execute at the same time, even on
machines with multiple processors.
The specific flavor of thread offered by this module also guarantees you that
it will not switch between threads unless necessary. It switches at easily-
identified points in your program, so locking and parallel access are rarely
an issue, making threaded programming much safer and easier than using other
threading models.
Coro provides a full shared address space, which makes communication between
threads very easy. A parallel matrix multiplication benchmark runs over 300
times faster on a single core than perl's ithreads on a quad core using all
four cores.